moon knight and iron man and iron fist
i can't see moon knight reading fanfiction but jean-paul duchamp probably pulled up some self-insert fic once and read it loudly and obnoxiously to make fun of him. at which point mk asks "how did you find this" and then jean-paul changes the subject and never brings it up again
tony has 100% read fanfiction for whatever fandoms he's in and then about himself. obviously he and steve are a popular rpf ship but before even that. before his public identity reveal. stevetony's main competition was ironstark, where rpf shippers were convinced that tony was secretly in love with his beloved bodyguard. so when the identity reveal happened people lost their minds and marvel universe tumblr crashed for an entire week. tony sends carol any and every femslash fanfiction that's remotely similar to her "platonic friendship" with jess.
powerfist is a super popular ship in universe so danny and luke frequently hear about this. if danny is dating luke and jessica then jessica will send danny very badly written fisting porn about him and luke. I actually do remember luke holding a book with rpf of them but for the life of me I can't remember which comic it was.
edit: thanks to @/bookoftheironfist and @/samsonet3 for reminding me:
Patsy Walker, A.K.A. Hellcat! (2016) #7
